Climate Home: US president Barack Obama and Argentina president Mauricio Macri have agreed to work together on climate change and approve the 2015 Paris agreement by the end of 2016. The pair said they would work to secure a global deal to cut aviation emissions this year, phase out potent warming gases known as HFCs and scale up renewables. We share a commitment to protect this planet for our children and grandchildren, said Obama in a press conference on Wednesday. The presidents support was critical to...